Example : When hearts were young and gay.
A poet could not but be gay, in such a jocund company.
The jolly crowd at the reunion.
Jolly old Saint Nick.
A jovial old gentleman.
Have a merry Christmas.
Peals of merry laughter.
A mirthful laugh.

Synonyms : gay, jocund, jolly, jovial, mirthful

Example : A festive (or festal) occasion.
Gay and exciting night life.
A merry evening.

Synonyms : festal, festive, gay

Example : A brisk walk in the park.
A lively gait.
A merry chase.
Traveling at a rattling rate.
A snappy pace.
A spanking breeze.

Synonyms : alert, brisk, lively, rattling, snappy, spanking, zippy